Wunder Audio CM7 User Manual

wunder cm7

This microphone has been meticulously created to meet the demand for
the U47 sound using historically correct components around the “heart“
of the microphone – the original, specially selected EF14 tube.

It should be stressed at this point, that vacuum tubes with their heater
filaments are much more delicate than solid-state components.
Consequently, the user has to take great care in handling the microphone.
Drops from even moderate heights may cause the filament to break and
would result in immediate failure of the microphone. It would be advisable
for the users to keep a spare tube – specially selected by an Wunder
Audio Service Department – always ready or replacement.

Repairs are to be carried out only by experienced, authorized service personal. Unauthorized
opening or modification to the equipment shall void the warranty. High Operation voltages are
required for the tube in the microphone. Contact with the voltages present in the interior of the
device can result in injury of death; therefore, the microphone and PSU must be opened only
by authorized, qualified personnel. The microphone must be operated only with the supplied
cable. Since hazardous voltages are generated by the PSU that can result in injury or death,
always ensure that the microphone cable used is undamaged, Damaged cables must no
longer be used.

Please note: tube may have become slightly unplugged in shipping.! If
after shipping the microphone has no audio output, 99% of the time it is a
result of a slightly unplugged tube.

Replacing the vacuum tube

1. Disconnect microphone from PSU.

2. Remove the three bright nickel screws at the lower end of the
microphone grille housing.

3. Pull the grille off in upwards direction.

4. Remove the small screw that is located several inches below the
Wunder Audio diamond badge.

5. Pull the complete body shell off in an upwards direction.

6. Remove the black rubber donut shaped dampener by pulling
downwards off the tube.

7. Remove the vacuum tube by grasping the black rubber shock-mount
in one hand and the tube in the other hand – wiggle the tube to free it
with a forward motion. Holding the tube socket in one hand and the

tube itself in the other hand will help you separate the vacuum tube
from the socket.

8. Installing a new tube is simply the reverse order of these steps.

Operation

The CM7 is equipped with a 6-pin Tuchel connector that plugs into the
base of the microphone and screwed finger tight.

Always make sure that the PSU is switched off when plugging the mic
connector into the mic and PSU.

Changing the Pattern

Locate the white pattern switch window at the bottom of the grille
housing. Place your finger on the very small handle and slide the switch
sideways to change from Cardioid to Omnidirectional pickup pattern and
visa-versa.

The Omnidirectional! pattern is achieved by disabling the polarization
voltage to the rear diaphragm. The U-47 did not maintain equal output
levels across patterns.

2